Hello, my shoulders are very slim, 38cm/15". Measured from a shirt I own, I'm that petite. So far I've been getting off clothes made for kids but not only their overall quality is very poor but also the fabric and colors themselves are very limited, so I wanted to move to adult clothes.
So I've been looking into measurements before buying online and they're, as expected, always larger than mines: 42cm, 44cm, etc. (that's 16.5" and 17" respectively). I'm looking into casual shirts so drop shoulders aren't that important to avoid, but at which range should I try to stay at?